In case you weren't paying attention: Ariana Grande is here. In a big way.

The singer's smash single, "Problem," will earn a spot in the history books when it lands the eighth-biggest debut ever on the BillboardDigital Songs chart this week.

Huge Problem

Grande's collabo with Iggy Azalea moved 438,000 copies, for the biggest chart debut of the year and the best first week for a song on that chart since Katy Perry's "Roar" shifted 557,000 in August. Iggy had a pretty great week too, with her Charli XCX single "Fancy" hopping four spots to #2 on sales of 222,000.

All the change meant that after 11 weeks at #1 Pharrell Williams' "Happy" slipped down to #3 (174,000) while John Legend's "All of Me" moved two spots down to #4 (161,000).

The biggest mover of the week, though, was MTV Artist to Watch Rixton's "Me and My Broken Heart," which shot up 18 spots to #7 (111,000) after they performed on "The Voice" and "The Ellen DeGeneres Show."

'Frozen' Shoppers Are Two Thousand And Late

Seriously, who is still buying the "Frozen" at this point? The chart-dominating soundtrack is just toying with us now, topping the Billboard 200 album chart for a 13th week on sales of another 106,000, according to figures provided by Nielsen SoundScan. That's more than 2.5 million copies in circulation to date and, honestly, if you just picked it up last week, might we interest you in some Crocs, or maybe an iPhone 3?

In week two, Azalea's The New Classic dropped 57 percent and two spots to #5 (23,000), while Future's Honest was down 63 percent and five spots to #7 (20,000). Former MTV Artist To Watch Timeflies' debut, After Hours landed at #8 (20,000).